Proliferation Security Initiative

Security & Nonproliferation

Interdiction Principles for the Proliferation Security Initiative

  • interdict transfers to and from states and non-state actors of proliferation concern to the extent of their capabilities and legal authorities;
  • develop procedures to facilitate exchange of information with other countries;
  • strengthen national legal authorities to facilitate interdiction; and
  • take specific actions in support of interdiction efforts.
  • The more than 100 countries that have endorsed the PSI so far share a deep concern that WMD, their delivery systems, and related materials could fall into the hands of terrorists. All of these countries have endorsed the effort to make PSI a flexible, voluntary initiative geared toward enhancing individual and collective partner nations’ capabilities to take appropriate and timely actions to meet the fast-moving situations involving proliferation threats.
Map highlighting the 107 PSI members

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U.S. Department of State

The Lessons of 1989: Freedom and Our Future